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Return the expectation value for the passed operator and wavefunction

wfn (wavefunction.Wavefunction) - an FQE wavefunction on the ket side

ops (FermionOperator) - a Fermion Operator string to apply to the wavefunction

brawfn (wavefunction.Wavefunction) - an FQE wavefunction on the bra side if not specified, it is assumed that the bra nad ket wave functions are the same

(complex) - expectation value